Utility stove and burner assembly therefor



Dec. 13, 1949 B. w. TULLIS 2,491,430

UTILITY STOVE AND BURNER ASSEMBLY THEREFOR Filed July 31, 1946 2 Shets-Sheet 1 3rwentor 503d m Tu/lis Dec. 13, 1949 E. w. TULLIS 2,491,430

I UTILITY STOVE AND BURNER ASSEMBLY THEREFOR 2 Sheets-Sheet 2 Filed July 31, 194

57 If] .52 55 TI I I: 6/ A 8 5/ r l' l 50 E: 43 3nnentor 47 2 63- y W. Tull/s tlon' and equipped with my improved and the atomizer "and burner assembly.

Patented Dec. 13, 1949 UTILITY STOVE AND BURNER ASSENIBLY THEREFOR Boyd W. Tullis, Wichita, Kans, assi im'r to The Coleman Company, Inc., Wichita, Kans., a corporation of Kansas Application J uly31, 1946, Serial No. 687,277

10 Claims. (01. r's's5) This invention relates to a particularly to liquid hydrocarbon burners therefor which include "a generator for vaporizing the fuel and in the case of the heavier fuels such as kerosene, a fuel 'ato'fni'zing burner to preheat the generator and hereafter referred to as the atomlzeri v A principal objector the present invention is to provide a burner structure adapted for fabrication from pressed metal parts or stampings which penni't a uniform standard of burner operation due to. smooth surfaces of the stamped parts in contact with the vaporized fuel, accuracy iii "shape of the fuel 'pas'sageways formed by such parts and accuracy with which the parts may be made and assembled.

'It is also an object or the invention to proride a compact burner and atomizer arrangement which results in a stove of low height.

Other objects of the invention are to provide for securing the burner cap and bowl members in assembly'b'y means of a tubular member which also serves to provide a passageway through which the "atomizer operates in concentric relation with the'bur'ner; to provide a stove structure which allows for concentric mounting of the burner and atomizer relative to the fuel supply tank and an eccentric position of the main iuelsupply tube; to provide a simplified mounting of the burner on an insulating plate which in turn isfcarried by the iuel tank and shields the tank from radiant heat of the burner; and to provide the-main' fuel' supply-duct with a flexible portion to facilitate assembly of the burner and positioning the fuel duct connections where they are readily aces's-ible.

In accomplishing theselan'd' other objects of the invention hereinafter pointed out; I have provided improved structure, the preferred form of which is illustrated in the accompanying drawmg. wherein: a I F c Fig. :1 is a perspective view or'a utility stove constructed in accordance with the present ifnve'n atomizer assembly.

particularly illustrating 'the fuel supply ducts =Fig.' 3 is an enlarged section through the body otfithe "burner, particularly illustrating connectien of the parts by means of a tubular member. '4 isa cross section through the mixing chamber and ducts through which'vapjorized .iu-el lsneiiverea te "the burner.

; 5 is a perspective view or the parts or the burner {and '2 burner shown in disassembled relation to better illustrate the construction. I 7

Referring more in detail to the drawings:

I designates a utility stove constructed in accordance with the present invention and which is an improvement on the stove covered in Patent 2,246,080 on Portable stove granted to me June 17, 1941-, the stove of the present invention being equipped with an improved burner of the type disclosed in Patents 2,020,626 and 2,023,624, issued tome on November 12, 1935, and December 10, 1935, respectively, the present burner structure being adapted for use of one of the heavier hydrocarbon fuels such as kerosene.

The stove includes a fuel tank or fount 2 that has a bottom 3, a circumferential wall 4 and a crowned top 5. The center of the top 5 is pressed inwardly to, provide a depression 6 having a central opening Ii-n which-is attached a collar 8 that- 1 which are mounted lugs H having outwardly opening internally threaded sockets I2 for a pur pose later described. The top of the fount also has a .fill opening-13 located adjacent the marg-inalportio-n of the dome normally closed by a cap 14,- and throughwhich a liquid hydrocarbon fuel, for example, kerosene, is poured into the fpunt. The fount is also provided with a pump I5 by which air pressure is established on the top of the fuel to effect discharge of the fuel througha tube l6 supplyingan atomizer l1 later.

described and a main tube 48 supplying fuel to a generator: 1'9 also later described.

Threaded into the opening of the collar 8 is a nipple '20 having. an upwardly extending exter nally threaded neck 2! which mounts a fuel atomizer. 2'2 constructed in accordance with the atomizer disclosed in Patent 2,285,689, issued to me on June 9, I942. The atomizer is supplied with fuel through th tube i6 and is contained withina valve body 23. The valve body carries avertically positioned tube 24 having an air inlet 25 at the base thereof and which is of sufficient length to extend through the burner 26 later to be described.

The valve. body also carries a laterally positioned valve stem 21 having an operating knob 28 for shutting oh and regulating atomized fuel to the tube 23.

Positioned on, the dome-shaped top :of the; "fount ah'd iii encircling relation with the bosses ii} is a sheet metal band 29 having circumferentially spaced openings 38 through which air is admitted for supplying air to the air inlet opening of the torch and to maintain a cool space over the top of the fount. The lower edge of the band seats upon the top of the fount and the upper edge carries a base plate 3i on which the burner 26 is mounted as later described. The base plate 3| includes a sheet metal disk 32 having an upwardly extending marginal edge 33 to form a shallow pan adapted to catch drippings and the like. The central portion of the pan has an upwardly embossed portion 34 for enhancing the rigidity thereof and seating a burner mounting bracket 35. p

The base plate is anchored to the fount by screws 36 having shanks thereof extending through openings 31 in legs 38 of the bracket through registering openings in the base plate and into the internally threaded sockets [2 previously mentioned. The base plate is thus stably mounted and is adapted for rigidly supporting a grid in such a manner that there is no strain upon the fuel connection if a grid is desired.

The main tube !8 extends through the top of the fount by way of a collar 39 which is sealed in an opening of the top ofiset from the depression 6. The portion of the tube projecting from the collar has a substantially lateral bend 40 and extends loosely through and opening 4! of the spacing band 29 and which connects by a reverse bend 42 with an inlet connection of the generator unit that is located outwardly of the rim of the base plate and extends through an ear 43 that projects laterally from a tongue 44 formed as an' upward continuation of the marginal edge 33, the connect on of the tube being effected by a union nut 45.

The burner unit 26 includes a bowl member 46 provided with a base portion having a substantially cylindrical wall 41 and a flat bottom 48 that is provided with an axial opening 49. The

upper edge of the wall 4'! terminates in an out-.

minates in an outwardly extending flange 5| spaced above the outwardly extending portion 50. i

Located between the flanges are flat and transversely corrugated rings 58 and 59 alternating one upon another'to provide a plurality of radial passageways 60 about the burner so that a combustible mixture is distributed from the chamber of the burner bowl circumferentially of the burner. In order to retain the rings'in stacked relation the flange of the cap carries a plurality of depending pins 6! preferably three in number and which are adapted to engage the inner circumference of the rings as best shown in Fig. 3.

In order to retain the cap and bowl members of the unit assembly and to provide a passage.- way for the tube 24 the burner parts are con-p nected together by a tubular member or sleeve 62 having circumferential shoulders 53 and 64 at the ends thereof for spacing the members apart and having portions 65 and 66 spun over the outer faces of the bottoms 48 and 55 as shownin Fig.

3 to retain the parts in assembly. The chamber 54 is supplied with a, combustible fuel mixture and 15 of substantially semi-circular shape and which are connected by an arcuate wall 16 mergand i3.

member 12 terminate in an offset flange 18 to provide a seat 19 for the plate H. The flange extends a sufiicient distance beyond the plate ll so that the projecting portion may be turned inwardly-to secure the plate to the seat 19. The Bunsen tube 13 has a tapering bore 80 extending from the outer end thereof toward the arcuate provide an air inlet 82. 7 One flat side wall there 'v ofis provided with an opening 83 in which the end of theBunsen tube is sealed as by soldering or the like. The opposite wall has a registering opening 84 to support the nozzle end 85 of the,

vaporizing tube 86 of the generator unit so that the vaporizing tube is securely supported transversely of the burner and in position to be preheated by the atomizer burner.

The bracket 35 previously mentioned is in the form of a strap having a central aperture 81 to.

pass the atomizer tube and the ends are bent downwardly over opposite sides of the central boss. of the base plate to provide the anchoring legs.

The bracket is applied to the bottom of the.- burner bowl member by spot welding or other suitable fastening means. In assembling the stove and assuming that the pump l5 and fill connection I3 are applied to the fount, the nipple 20 is screwed into the collar 8 -to-make an air and liquid tight joint by reason The vaporizing mech-;

of the tapered threads. anism 22 is applied to the tube 16 and the tube inserted through the nipple 20. The valve body 23 is then screwed over the nipple with the stem 21 positioned in the desired direction. The tube 24 is then connected with the valve body so as to project upwardly coaxial with the fount. The main tube I8 is then applied in the collar and sealed in position. The spacing band 29 is moved to a position where the end of the reverse bend 42 of the main tube passes through the opening 4|.

The band is then shifted to pass'the valve stem through one of the openings 30 and to a position seating upon the dome-shaped top 5 of the fount.

The insulating plate 3| is then applied over the torch I! so that the tube 24 passes through the 5 center opening therein. The bracket 35 is then applied to the bottom 48 of the burner bowl 46 with the aperture 81 of the bracket registering with the passageway through the tube 62. The

tion 32 of the base plate 3|. The openings 31. in

the legs of the bracket are then registered with the openings '38. in: the disk portion of the 1811s latin'g plateand the. plateis turned-so that. the

openings register with the sockets 12 The screws.

3-are then inserted through'thesopeningsand turned into :the internally threaded sockets I 2 to;

draw the insulating plate-tightly. against the spacing band: '29 and thespac'i-ng band. firm contact withdome shaped top of the. fount. The:

vaporizer unit 19 is then. appliedso that the nozzle-end 85- passes through the opening'dtof the-air mixing chamber- 8L and the connecting branch of the. generator valvis passed through.

the-ear 43 to be anchored by alock nut 81. The main tube is then connected by the. unionnut '45 to complete the assembly.

In. using the stove, .a liquid hydrocarbon fuel suchaskeroseneis poured into the fount through the'fill-opening :13 afterwhichthe cap H. is applied. and vfirmly 'seated'to close the fount.

With the valves-closed, pressure generated in:

tube 86. When the tube isrheated 'surficiently to vaporize Jthev fuel, theknob. 28; is rotated to close flow through thextuba [6. The air: in the fount then forces the fuel through the main duct 4 8 and=through thet'vaporizer tube for vaporization by the heat of the torch. The fuel is discharged through the nozzle-85 as vapor which mixeswith .the air admitted through the: air inlet 82 of the mixing chamber andthe mixture is discharged through the Bunsen tube I3 and against the rounding surface Hi-of the heater 12 so that the mixture is directed into the tube 6?- for discharge into the chamber of the burner bowl. The vapor then flows out throughthe radial openings formed between the burner rings 58 and 59 and burns when the burner is lighted so. as to provide the necessary heat andto heat the -vaporizer tube without continued operation of the atomizer burner.

From the foregoing it is obvious that I have provided a burner unit capable of formation from stamped metal parts and which :may be: readily secured together to provide burners having uniform operating characteristics. It is also obvious that I have provided a very compact structure and a substantially low stove by locating the atomizer concentric of the burner. I have also provided a concentric support for the burner on the iount and have provided for oflcenter mounting of the main supply pipe which connects the fount with the generator to facilitate assembly and stability of the stove structure.

What I claim and desire to secure by Letters Patent is:

1. A device of the character described including a burner for liquid hydrocarbon fuels and having an axial air passageway, a fuel vaporizer, means for supporting the fuel vaporizer above the burner and extending across said passageway in position to be heated by the flames from said burner, duct means for connecting the vaporizer with the burner, and a liquid fuel atomizer substantially coaxial with and positioned to operate through the air passageway of the burner for preheating the vaporizer.

2. In a device of the character described, a burner including a bowl member having an openme, a capmember having. an opening registering with the opening of the bowl member, meansbetween thewcapand :b'o wl members for. forming jet-openings forxthe burner, a tube having ends anchoredin theregi'sterin'g openings of the bowl and cap members toretain said parts in assembly, and a .liquid fuelatomizer coaxially 'of the tube and discharging: aboveithe "cap member.

3. 'In -a. device-bf the character described, a burner including-a bo'wl member havinga 'central opening, a cap member having an Opening registering with the central opening or the bowl member, alternate dial; and corrugated rings stacked one upon-another between the bowl and cap members: aituibe concentric with said rings and having-endsanchored in said registering openings bfthebowl and cap members to retain said parts in assembly, and logs on one of "the members and engaging the rings to retain the rings in concentric relation.

e. in adevice-ermine character described, a burner assembly (if-stamped metal parts including a'bowl' mc'mber havingan outwardly and upwardly-curving flange, a cap member for the bowl member anuhavmg an-annular flange everlyi'ng said firsftfnamed flange but terminating short of the curvin portion or said flange, jet rings supported between said flanges, a "spacing tube .havinghnds anchored in the bowl and cap members to retain said members as'se'n'iblyahd providing happening through the burner,- a fuel vapor 'sl'l p'ply tube connected Wit-h the bowl member and-extending outwardly therefrom, an air inlet member arranged transversely of the vapor supply tube and having-a nozzle receiving open ing above-"the plane of the flange of the cap member, a Bunsen tube connected with the air inl'et memberya header -'connecting the Bunsen and su ply-tubes, a vaporizing tube extending across the eap member or the burner and having a nozzle in the nozzle receiving opening for discharge into the air inlet member, and a fuel atomizer discharging throughthe spacingtube for preheating the vaporizing tube.

-5. In-aneviee of the character described, a burner assembly 'of stamped metal parts includiugaboWl member. having an outwardly and upwardly curving flange, a cap member for the bowl memberandhavin an annular flange overlying said. first .named. flange but terminating short of the curving portion of said flange, an assembly of rings having lateral jet openings supported between said flanges, a spacing tube having ends anchored in the bowl and cap members to retain said members in assembly and providing an opening through the burner, a fuel vapor supply member connected with the bowl member and extending outwardly therefrom, a U-shaped duct connected with the fuel vapor supply member, an air inlet member arranged transversely of the vapor supply tube and having a nozzle receiving opening above the plane of the flange of the cap member, a Bunsen tube connected with the air inlet member, and having connection with the vapor supply tube through the U-shaped duct, a vaporizing tube extending across the cap member of the burner and having a nozzle positioned within the nozzle receiving opening of the air inlet member, and an atomizer discharging through said opening of the burner for preheating the vaporizing tube.

6. A stove of the character described including a fount for containing fuel under pressure, a burner, means providing an axial opening ing discharge into the burner, an atomizer ex-v tending through said axial opening of the burner and terminating under the vaporizer, and sep arate means for supplying the atomizer and the vaporizer with fuel from said fount.

7. A stove of the character described including a fount, a burner, means providing an axial opening through the burner, an insulating plate, a spacing band having support on the fount and mounting the insulating plate, means for supporting the burner on the insulating plate, fastening devices having anchorages in said fount to retain said parts in assembly, a vaporizer extending across the center of the burner, duct means connecting the vaporizer with the burner, an atomizer having a fuel tube extending from adjacent the bottom of the fount through the top of the fount concentrically with the axial opening in said burner, a valve member connected with the atomizer, a tubular discharge for atomizer extending through said axial opening of the burner and terminating under the vaporizer, and a main fuel supply tube excentrically of the axis of the tank and having a lateral bend extending through an opening in the spacing band and connected with the vaporizer for supplying fuel to the vaporizer.

8. A stove of the character described including a fount, a burner, means providing an axial opening through the burner, a vapor supply tube connected with the burner, an air inlet member above the supply tube, a Bunsen tube connected with the air inlet member, a header connecting the Bunsen and supply tubes, an insulating plate, a spacing band having support on the fount and mounting the insulating plate, a bracket fixed to the burner and having leg portions supported on the insulating plate, fastening devices extending through said leg portions of the bracket and the insulating plate and having anchorage in said fount to retain said parts in assembly, a vaporizer extending across the center of the burner and having a discharge end supported in an opening of the air inlet member, means on the insulating plate supporting the other end of the vaporizer, an atomizer, a supply tube for the atomizer extending from adjacent the bottom of the fount through the top of the fount concentrically with the axial opening in said burner, a valve member connected with the atomizer, a discharge tube connected with the atomizer and extending through said axial opening of the burner and terminating under the vaporizer, and a main sup: ply tube extending from the fount eccentric of the fount and having connection with the vaporizer for supplying fuel to the vaporizer.

9. In a device of the character described, a burner including a bowl member having a central opening, a cap member having an opening regis tering with the opening in the bowl member, means between the cap and bowl members for forming jet openings for the burner, and a tube extending through the registering openings of the bowl and cap members and having annular her having an outwardly and upwardly curving flange, a cap member for the bowl member and having an annular flange overlying the first :named flange but terminating short of the curving portion of said flange, jet rings supported between said flanges, a tube having ends anchored in the bowl and cap members to retain said members in assembly and providing an open- :ing through the burner, an atomizer with discharge outlet coaxial with said opening for preheating the vaporizing tube.

BOYD W. TULLIS.

REFERENCES CITED The following references are of record inthe file of this patent:

UNITED STATES PATENTS Number Name Date 806,308 White Dec. 5, 1905 5 1,531,959 Lefebvre Mar. 31, 1925 1,780,421 Fortier Nov. 4, 1930f 1,887,140 Risinger Nov. 8, 1932 2,023,624 Tullis Dec. 10,1985- 2,248,080 Tullis June 17, 1941 FOREIGN PATENTS Number Country Date 802,484 Germany Sept. 10, 1984 

